According to my vet this is the only option for my cat with bladder crystals. The cats like the food, and it is obviously a necessity for him since it treats a medical condition. So far he is doing well and his siblings are all to happy to partake with him since it would be impossible to separate them for feedings. Which is really why I hate and love this product. Of course, I want the best for my cats and want to take care of them. However, I do not understand why it has to be so expensive and scarce. This is a prescription food, therefore it is expensive and I have to drive a half hour to my vet to purchase it, because my local feed store is not able to carry it. However, it is fine if the other cats eat it and does them absolutely no harm... Why is it so protected then, and if this is such a common problem in cats why is this the only brand available? Quality of Ingredients It is the only option so it must be the best... Flavor Selection There is one flavor available.